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Date: Tue, 21 Nov 2006 11:23:26 -0500
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From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to: <4562f5df$0$49206$14726298@news.sunsite.dk> (message from Mark
	Carter on Tue, 21 Nov 2006 12:49:33 +0000)
Subject: Re: make djgpp predefined variables, and some sundry questions
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> It's no longer a pressing issue, but a question worth asking anyway: 
> what DJGPP-relevant variables are predefined by make?

If you mean #defines, you can use __DJGPP__ to detect that you're
using DJGPP, or __GNUC__ for gcc in general.

You can loko for the ${DJGPP} environment variable being set within
make if you need to detect it there.  Or check MAKE_VERSION, or look
for ${CC} being gcc.

> Also, a bit lazy, I know, but are there any libraries available for 
> processing files one line at a time,

The C library does that.  Use fgets().

> and is there a date/time library 
> for calculating the day of the week,

Likewise, use mktime() and localtime()

> and other such useful calendar functions?

localtime() again.